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Memory consumption of prince vs dompdf

I am looking to generate a few PDFS through web requests. Each PDF is generally about 3-4 pages along with a simple set of strings. What I want to know, is how does prince compared to dompdf w.r.t memory consumption.

Although the PDF generated are small, there will be at least 50 users concurrently requesting them duding peak usage on the web site.

Any data, people would like to share, before I invest time/effort in running a benchmark.
From what I gather, Prince should be faster than DOMPDF, which means that for many concurrent users at least the processes will not stay in memory for as long. However, for short documents without many large images I would not expect memory usage to be a big problem in the first place.